<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div class="parent">
        <div class="child1"></div>
        <div class="child2"></div>
        <div class="child3"></div>
    </div>
    <style>
        .parent{
            width: 90px;
            height: 300px;
            background-color: gray;
            padding-left: 10px;
            
            padding-top: 10px;
            margin: auto;
        }
        .parent .child1{
            background-color: red;
            width: 80px;
            height: 80px;
            border-radius: 50%; 
            
            
        }
        .parent .child2{
            background-color: green;
            width: 80px;
            height: 80px;
            border-radius: 50%; 
            margin-top: 20px;

        }
        .parent .child3{
            background-color: orange;
            width: 80px;
            height: 80px;
            border-radius: 50%; 
            margin-top: 20px;

        }
    </style>
</body>
</html>